With scientific information suggesting a potential risk of future ozone depletion with continued growth in use and emissions of CFCs and other ozone depleting gases, countries negotiated and agreed to the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987.
The Protocol originally called for a 50% reduction in consumption (use) of CFCs in developed countries by 1999. When subsequent scientific assessments showed that ozone depletion was occurring, and projections suggested even more depletion would occur under the initial Protocol controls, the controls were modified to phase out all compounds with significant potential to deplete the ozone layer. These phaseout schedules were formulated based on the relative ability of compounds to impact the ozone layer (known as "ozone depletion potentials" or ODPs). Compounds with higher ODPs were placed on faster phaseout schedules.
The internationally agreed upon schedules can be found on pages 56 to 73 of the Montreal Protocol Handbook.
Under the Montreal Protocol, individual countries are allowed to determine their own forms of regulations as long as they meet or exceed the schedules defined by the Protocol. These country regulations can vary significantly and individuals should consult their local regulatory authority for detailed information on the regulations.
Select country and regional web sites are provided below: